Levchenko (; , Leuchanka, Leŭčanka) is a surname of Ukrainian origin. It derives from the personal name Levko. The surname, Levchenko, was created by adding the Ukrainian patronimic suffix, -enko, me
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e4ba83887f879d4acf6eaebcbe4dcbde3ba24e050fc7cae0d5d64447c725b2. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f3fb6444-bec4-47aa-8154-8890279729e2.json and https://artists.proofprofile.net/proofs/artist/f3fb6444-bec4-47aa-8154-8890279729e2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da13638ff941f203e69410db65d52d062a26ac9098a7c804de8a75f6b7626c1. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA092381310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c7854ab715511691b273a1017c8682f7ecaf46028a461bb00e7563e312b68b. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T12:27:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMFMG2321221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdefac0c3d6fa934463a466992815b10a4f26897dff9b1ef1fcbbe16119ad3b6e. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TX2476760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702e251fcb52eb13cb9c2df84cc2df4d7fdefcd5b80592e2fc7647c67bf45041. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T13:02:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ2462925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90df309cf8785052fcfa343b84180f944ea73f7c561dba118dafa0d84c2e7d87. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAGOO2441246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29355fbbafcff11a388c097b9c0beaeaf52106dc718523a97e4cab79bfa4963a. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAGOO2485034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ed6679e8694ab7f553846325c1a6ec7705447adc9eb775951cb751640aed5e. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CALVP2403098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d80111d8c289413519c3d08f6c1e043ead2874f9b051632896ee912a49dc07. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T19:12:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CBEYJ2468811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a5c05641e12a3f7cd8d706f620da758af478be94e2fc11354fd94944a104a8. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:25:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAHQJ2513529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac2683b69101863e9f69c2131284aac4862d1a2b27786ddc03393fb93f82768. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CACWV2506469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a850f5dc57b8ead13260854cbba37d6812f5fe157dfd853c8c93e715f1663c. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T12:03:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CACWV2523184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec8752fa7d6d305c7cad2a5a7e935bd0f71ebc568ba02d34cfc87c003b87ee5. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAENV2550656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5a02ec42685fc19ad311f673a6435a3c9c1ead1a2394f63700c91bd94fd9d0. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T05:31:14Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAGOO2526030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a31459d966508d053560f1fec71637751b6fda89b243f8e70fda93c4ef9104f. Chain 2 (Bitcoin): anchored in block 958865 (2026-07-20T12:59:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAGOO2582666.